Sheet of insertable reference divider tab labels



FIG. 1 is a perspective view of a sheet of insertable reference divider tab labels showing my new design; and,

FIG. 2 is a front view of FIG. 1, it being understood that the back view thereof is a mirror image of the front view.

The broken lines in the figures are shown for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a sheet of insertable reference divider tab labels, as shown and described. 